Democrats are winning the battle in voter registration, especially in key battlegrounds, and some Republicans are worried that it will make it much harder to close the gap in the polls in those states, The Washington Examiner reports.

The increased advantage in registered Democrats could turn out to be a key factor, especially as early and absentee voting is just around the corner and a higher percentage of voters use that alternative.

Since time is fast running out to possibly make up the difference, Republican operative Joseph Catania stressed that "the GOP needs to do more about this or soon it could be really bad."

For example, in the key swing state of Nevada, the Democrats' advantage in registered voters has grown by almost 20,000 this year to more than 66,000. With that sort of built-in lead, it makes it more difficult to imagine the GOP winning the state, which they lost in the 2012 election. This, despite the fact that current polls show the two candidates in a tight race.

However, the story is not the same in every battleground state. In Florida, with a massive 29 electoral votes and which Barack Obama won the past two elections, the Democrats' advantage in registered voters has taken a hit, the Miami Herald reports.

In 2008, registered Democrat were 42 percent of all voters, while Republicans had 36 percent. That advantage has dwindled significantly. The Democrats currently have only 38 percent of voters, while the GOP has remained steady at 35.8 percent, with the remainder registering with no party affiliation.

Democrats are winning the battle in voter registration, especially in key battlegrounds, and some Republicans are worried that it will make it much harder to close the gap in the polls in those states, The Washington Examiner reports.